A metal rod of length L in a region of space where a constant magnetic field points into the page rotates clockwise about an axis through its center at constant angular velocity ?. While it rotates, the point(s) at highest potential is(are)
A. A.
B. B.
C. C.
D. D.
E. A and E.
Answer: E
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Reactance: At what frequency does a 10-?F capacitor have a reactance of 0.12 k??
Fill in the blank(s) with the appropriate word(s).
What is the primary product created by the fusion of hydrogen in the core of the Sun?
A) hydrogen compounds B) plasma C) carbon and oxygen D) radioactive elements like uranium and plutonium E) helium
The impact of a 100 meter asteroid could kill many people if it struck a major city. Suppose the probability of such an impact in any single year is 1 in 1,000, and suppose we know (somehow) that it has been 1200 years since the last impact
What would that tell us? A) The prediction must be wrong, since the time since the last impact has been 1200 years. B) Nothing, we would still presume that the chance of such an impact during the next year is 1 in 1000. C) We are overdue for such an impact, so we should expect to be hit by something even larger during the next few years. D) We are now due for such an impact, so the actual probability for the coming year must be much higher than 1 in 1000.
A nuclear reaction is said to be endothermic if the total kinetic energy is
A) less after the reaction than before. B) equal both before and after the reaction. C) greater after the reaction than before. D) zero after the reaction.